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        <p><div style="color:Chocolate;text-align:center;display:inline-block;width:100%;">
AOP(Aspect Oriented Programming)
</div><br><span id="more"></span></p>
<p><a target="_blank" rel="noopener" href="https://zhuanlan.zhihu.com/p/161705262">参考文档一</a></p>
<hr>

<h2 id="Spring-AOP-概述"><a href="#Spring-AOP-概述" class="headerlink" title="Spring AOP 概述"></a>Spring AOP 概述</h2><h3 id="什么是面向切面编程"><a href="#什么是面向切面编程" class="headerlink" title="什么是面向切面编程"></a>什么是面向切面编程</h3><p>在软件开发中，散步于应用中各处的功能被称为 <strong>横切关注点</strong> (比如日志、安全和事务管理)。通常来讲，这些横切关注点从概念上是与应用的业务逻辑相分<br>离的(但是往往会直接嵌入到应用的业务逻辑中)。把这些横关注点与业务相分离正是 <strong>面向切面编程(AOP)</strong> 所要解决的问题。</p>
<h3 id="面向切面编程的好处"><a href="#面向切面编程的好处" class="headerlink" title="面向切面编程的好处"></a>面向切面编程的好处</h3><ol>
<li>每个横切关注点都集中于一个地方，而不是分散到多处代码中</li>
<li>服务代码更简洁，因为它们只包含业务逻辑的代码，而横切关注点的代码被转移到一个统一的地方了。</li>
</ol>
<h3 id="AOP-中的几个术语"><a href="#AOP-中的几个术语" class="headerlink" title="AOP 中的几个术语"></a>AOP 中的几个术语</h3><ol>
<li>横切关注点</li>
<li>连接点</li>
<li>切点</li>
<li>通知</li>
<li>切面</li>
<li>织入</li>
<li>引入</li>
</ol>
<div class="table-container">
<table>
<thead>
<tr>
<th style="text-align:center">术语名称</th>
<th style="text-align:center">术语解释</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:center">横切关注点</td>
<td style="text-align:center">跨越应用程序多个模块的方法或功能</td>
</tr>
<tr>
<td style="text-align:center">连接点</td>
<td style="text-align:center">在应用执行中能够插入切面的一个点</td>
</tr>
<tr>
<td style="text-align:center">切点</td>
<td style="text-align:center">真正需要插入切面的一个或多个连接点</td>
</tr>
<tr>
<td style="text-align:center"></td>
<td style="text-align:center">即通知被应用的具体位置(在哪些连接点)。</td>
</tr>
<tr>
<td style="text-align:center"></td>
<td style="text-align:center">通常使用明确的类和方法名称，</td>
</tr>
<tr>
<td style="text-align:center"></td>
<td style="text-align:center">或是利用正则表达式定义所匹配的类和方法名称来指定这些切点(比如 <strong>Aspect 切点表达式</strong>)</td>
</tr>
<tr>
<td style="text-align:center">通知</td>
<td style="text-align:center">切面的工作被称为通知。即包含了需要用于多个应用对象的横切行为</td>
</tr>
<tr>
<td style="text-align:center">切面</td>
<td style="text-align:center">切面是通知和切点的结合。通知和切点共同定义了切面的全部内容—它是什么，在何时和何处完成其功能</td>
</tr>
<tr>
<td style="text-align:center">织入</td>
<td style="text-align:center">把切面应用到目标对象并创建新的代理对象的过程</td>
</tr>
<tr>
<td style="text-align:center">引入</td>
<td style="text-align:center">向现有的类添加新方法或属性</td>
</tr>
</tbody>
</table>
</div>
<div class="table-container">
<table>
<thead>
<tr>
<th style="text-align:center">通知名称</th>
<th style="text-align:center">说明</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:center">前置通知(Before)</td>
<td style="text-align:center">在目标方法被调用之前调用通知功能</td>
</tr>
<tr>
<td style="text-align:center">后置功能(After)</td>
<td style="text-align:center">在目标方法完成之后调用通知，此时不关心方法的输出是什么</td>
</tr>
<tr>
<td style="text-align:center">返回通知(After-returning)</td>
<td style="text-align:center">在目标方法成功执行之后调用通知</td>
</tr>
<tr>
<td style="text-align:center">异常通知(After-throwing)</td>
<td style="text-align:center">在目标方法抛出异常后调用通知</td>
</tr>
<tr>
<td style="text-align:center">环绕通知(Around)</td>
<td style="text-align:center">通知包裹了被通知的方法，在被通知的方法调用之前和调用之后执行自定义的行为</td>
</tr>
</tbody>
</table>
</div>
<h2 id="Spring-AOP"><a href="#Spring-AOP" class="headerlink" title="Spring AOP"></a>Spring AOP</h2><h3 id="Spring-AOP-的原理机制-动态代理"><a href="#Spring-AOP-的原理机制-动态代理" class="headerlink" title="Spring AOP 的原理机制(动态代理)"></a>Spring AOP 的原理机制(动态代理)</h3><p>通过在代理中包裹切面，Spring 在运行期把切面织入到 Spring 管理的 bean 中。<br>代理类封装了目标类，并拦截被通知方法的调用，再把调用转发给真正的目标 bean(目标对象)。当代理拦截到方法调用时，在调用目标 bean 方法之前，会执行切面逻辑。<br>参考下面的图形:<br><img src="http://localhost:4000/2022/01/05/springboot%E9%9D%A2%E5%90%91%E5%88%87%E9%9D%A2%E7%BC%96%E7%A8%8B/001.png" alt="001"></p>
<h2 id="SpringBoot-集成-AOP"><a href="#SpringBoot-集成-AOP" class="headerlink" title="SpringBoot 集成 AOP"></a>SpringBoot 集成 AOP</h2><h3 id="jar-包引入"><a href="#jar-包引入" class="headerlink" title="jar 包引入"></a>jar 包引入</h3><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">     <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.springframework.boot<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">     <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>spring-boot-starter-aop<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br></pre></td></tr></table></figure>
<h3 id="编写一个自定义的注解"><a href="#编写一个自定义的注解" class="headerlink" title="编写一个自定义的注解"></a>编写一个自定义的注解</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.personal.springboot.aop;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.lang.annotation.Documented;</span><br><span class="line"><span class="keyword">import</span> java.lang.annotation.ElementType;</span><br><span class="line"><span class="keyword">import</span> java.lang.annotation.Retention;</span><br><span class="line"><span class="keyword">import</span> java.lang.annotation.RetentionPolicy;</span><br><span class="line"><span class="keyword">import</span> java.lang.annotation.Target;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> dong2.wang</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span> 2022/1/5 13:55</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Target({ElementType.PARAMETER, ElementType.METHOD})</span></span><br><span class="line"><span class="meta">@Retention(RetentionPolicy.RUNTIME)</span></span><br><span class="line"><span class="meta">@Documented</span></span><br><span class="line"><span class="keyword">public</span> <span class="meta">@interface</span> CheckParam {</span><br><span class="line"></span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h3 id="编写切面"><a href="#编写切面" class="headerlink" title="编写切面"></a>编写切面</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.personal.springboot.aop;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.aspectj.lang.JoinPoint;</span><br><span class="line"><span class="keyword">import</span> org.aspectj.lang.ProceedingJoinPoint;</span><br><span class="line"><span class="keyword">import</span> org.aspectj.lang.annotation.After;</span><br><span class="line"><span class="keyword">import</span> org.aspectj.lang.annotation.Around;</span><br><span class="line"><span class="keyword">import</span> org.aspectj.lang.annotation.Aspect;</span><br><span class="line"><span class="keyword">import</span> org.aspectj.lang.annotation.Before;</span><br><span class="line"><span class="keyword">import</span> org.aspectj.lang.annotation.Pointcut;</span><br><span class="line"><span class="keyword">import</span> org.aspectj.lang.reflect.MethodSignature;</span><br><span class="line"><span class="keyword">import</span> org.springframework.core.annotation.Order;</span><br><span class="line"><span class="keyword">import</span> org.springframework.stereotype.Component;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 自定义校验参数切面</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> dong2.wang</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span> 2022/1/5 13:57</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Component</span></span><br><span class="line"><span class="meta">@Aspect</span></span><br><span class="line"><span class="meta">@Order</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">CheckParamAspect</span> {</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Pointcut("@annotation(com.personal.springboot.aop.CheckParam)")</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">pointCut</span><span class="params">()</span> {</span><br><span class="line">    }</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * 切面前置处理</span></span><br><span class="line"><span class="comment">     *</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span> joinPoint 切点参数</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="meta">@Before("pointCut()")</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">before</span><span class="params">(JoinPoint joinPoint)</span> {</span><br><span class="line">        <span class="type">MethodSignature</span> <span class="variable">signature</span> <span class="operator">=</span> (MethodSignature) joinPoint.getSignature();</span><br><span class="line">        System.out.println(<span class="string">"打印: "</span> + signature.getDeclaringTypeName() + <span class="string">" 前置日志"</span>);</span><br><span class="line">    }</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Around("pointCut()")</span></span><br><span class="line">    <span class="keyword">public</span> Object <span class="title function_">around</span><span class="params">(ProceedingJoinPoint proceedingJoinPoint)</span> <span class="keyword">throws</span> Throwable {</span><br><span class="line">        Object[] args = proceedingJoinPoint.getArgs();</span><br><span class="line">        <span class="type">boolean</span> <span class="variable">hasAuth</span> <span class="operator">=</span> args != <span class="literal">null</span> &amp;&amp; args.length != <span class="number">0</span>;</span><br><span class="line">        <span class="keyword">if</span> (hasAuth &amp;&amp; !<span class="string">"-1"</span>.equals(args[<span class="number">0</span>].toString())) {</span><br><span class="line">            <span class="keyword">return</span> proceedingJoinPoint.proceed();</span><br><span class="line">        } <span class="keyword">else</span> {</span><br><span class="line">            System.out.println(<span class="string">"很抱歉 方法"</span> + proceedingJoinPoint.getSignature().getClass().getName() + <span class="string">"."</span></span><br><span class="line">            + proceedingJoinPoint.getSignature().getName() + <span class="string">"参数校验失败"</span>);</span><br><span class="line">            <span class="keyword">throw</span> <span class="keyword">new</span> <span class="title class_">RuntimeException</span>(<span class="string">"参数校验异常"</span>);</span><br><span class="line">        }</span><br><span class="line">    }</span><br><span class="line"></span><br><span class="line">    <span class="meta">@After("pointCut()")</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">after</span><span class="params">(JoinPoint joinPoint)</span> {</span><br><span class="line">        System.out.println(<span class="string">"调用 "</span> + joinPoint.getSignature().getName() + <span class="string">" 方法结束"</span>);</span><br><span class="line">    }</span><br><span class="line"></span><br><span class="line">}</span><br></pre></td></tr></table></figure>

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